CN109232786B - Water-based adhesive for preparing air filter paper and preparation method and application thereof - Google Patents
Water-based adhesive for preparing air filter paper and preparation method and application thereof Download PDFInfo
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- CN109232786B CN109232786B CN201810922134.7A CN201810922134A CN109232786B CN 109232786 B CN109232786 B CN 109232786B CN 201810922134 A CN201810922134 A CN 201810922134A CN 109232786 B CN109232786 B CN 109232786B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
Abstract
The invention discloses an aqueous adhesive for preparing air filter paper, and a preparation method and application thereof. The aqueous adhesive comprises A, B two components; wherein, the component A comprises 20-35 parts of methyl methacrylate, 0-20 parts of styrene, 20-50 parts of butyl acrylate, 2.5-5 parts of methacrylic acid, 1-5 parts of hydroxyethyl methacrylate, 0.5-5 parts of N-hydroxymethyl acrylamide, 3-10 parts of silane coupling agent I, 0.8-2.2 parts of composite emulsifier, 0.25-0.6 part of pH buffering agent, 0.25-0.6 part of initiator, 0-1.8 part of functional assistant and 95-125 parts of deionized water, and the component B comprises 50-85 parts of silica sol, 5-50 parts of silane coupling agent II and 10-30 parts of curing assistant. The preparation method of the aqueous adhesive comprises the preparation of the component A and the preparation of the component B. In addition, the invention discloses application of the aqueous adhesive in preparation of air filter paper, which can effectively improve the bursting strength, stiffness, tensile strength, water resistance and organic solvent resistance of the air filter paper.
Description
Technical Field
The invention relates to the field of aqueous adhesives, and particularly relates to an aqueous adhesive for preparing air filter paper, and a preparation method and application thereof.
Background
With the development of social economy and industrial technology, the ecological environment deteriorates rapidly, and various dust particles and microorganisms in the atmospheric environment in which human beings rely on living are increasing, which causes great harm to the industries of medical health, food, bioengineering, chemical manufacturing, aerospace, electronics, precision machinery manufacturing and the like. The filter prepared by the air filter paper has good air flow resistance and filtering efficiency, and can effectively intercept particle pollutants. Therefore, the filter is widely applied to the fields of air filtration of air inlet systems of internal combustion engines, air compressors and gas turbines, oil-gas filtration of air compressors, fresh air filtration of civil fields and the like.
The performance of the filter paper directly affects the overall performance of the air filter. Because the filter paper base paper has loose structure, loose combination among fibers, soft texture, poor water resistance and lower strength, all physical and chemical indexes can not meet the application requirements of the final product; therefore, the filter paper base paper must be reinforced by resin impregnation at a later stage. The filter paper after resin impregnation and curing can obtain excellent physical and chemical properties which are not possessed by a plurality of filter paper base papers, and even certain properties of the filter paper, such as water resistance, tensile strength, bursting strength and the like, must be obtained through resin curing. Based on the concept of environmental protection, the industry generally adopts water-based resin to realize the reinforcement of the filter paper base paper through crosslinking and curing, such as curing type pure acrylate emulsion, polyvinyl acetate emulsion, styrene-acrylic emulsion and the like. However, water-based resins have certain differences in bursting strength, stiffness, water resistance, solvent resistance and heat resistance compared with solvent-based resins; meanwhile, the method also has the defects of complex process, poor stability, inconvenient construction and the like. Therefore, how to better improve the waterborne resin to obtain products with excellent performance is a technical problem to be solved urgently in the industry.
In order to solve the above technical problems, the following 3 methods have been proposed in the art to modify aqueous resins: (1) adopts multi-component hybridization modification (2) introduces multi-double bond monomer internal crosslinking modification and (3) introduces external crosslinking or self-crosslinking system modification. After the air filter paper is treated by the aqueous adhesive modified by the method, the air filter paper still has poor bursting strength, stiffness, tensile strength, water resistance and organic solvent resistance.
Disclosure of Invention
In order to improve the bursting strength, stiffness, tensile strength, water resistance and organic solvent resistance of the air filter paper, the invention provides an aqueous adhesive for preparing the air filter paper and a preparation method and application thereof.
It should be noted that: the silicon functional group is a group which is directly connected on silicon and is easy to hydrolyze and condense.
The technical problem of the invention is solved by the following technical scheme:
an aqueous adhesive for preparing air filter paper comprises A, B two components; the A, B comprises the following specific components in parts by weight:
1) component A
2) B component
50-85 parts of silica sol
5-50 parts of silane coupling agent II
10-30 parts of a curing assistant.
Further, a carbon functional group at one end of the silane coupling agent I is one of vinyl and methacryloxy, and a silicon functional group at the other end of the silane coupling agent I is one of methoxy, ethoxy or isopropoxy; the silane coupling agent I is preferably 3- (methacryloyloxy) propyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane or vinyltriisopropoxysilane.
Furthermore, one end of the silane coupling agent II is a carbon functional group containing one or two of amino, sulfydryl and epoxy, and the other end of the silane coupling agent II is one of methoxyl, ethoxyl or isopropoxy; the silane coupling agent II is preferably gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, beta- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, gamma-mercaptopropyltriethoxysilane or gamma-aminopropyltriethoxysilane.
Further, the curing aid includes an alcohol or an ether; the alcohol is preferably ethanol, propanol, butanol, isopropanol, isobutanol or dipropylene glycol; the ether is preferably dipropylene glycol methyl ether or butyl ether.
Further, the composite emulsifier comprises an anionic emulsifier and a nonionic emulsifier, wherein the mass ratio of the anionic emulsifier to the nonionic emulsifier is (1-3): 1; the anionic emulsifier comprises alkyl carboxylate, alkyl sulfate salt or alkyl sulfonate; the alkyl carboxylate is preferably sodium lauryl sulfate; the alkyl sulfate is preferably sodium dodecyl diphenyl ether disulfonate; the alkyl sulfonate is preferably sodium dodecyl benzene sulfonate; the nonionic emulsifier is alkylphenol ethoxylates, and the alkylphenol ethoxylates comprises nonylphenol polyoxyethylene ether or octylphenol polyoxyethylene ether; the nonylphenol polyoxyethylene ether is preferably NP-10, and the octylphenol polyoxyethylene ether is preferably OP-10.
Further, the pH buffer includes sodium bicarbonate or sodium dihydrogen phosphate.
Further, the initiator comprises persulfate or azo water-soluble salt; the persulfate is preferably an inorganic persulfate; the inorganic persulfate is preferably potassium persulfate, sodium persulfate or ammonium persulfate.
Further, the functional auxiliary agent is organic amine; the organic amine is preferably a tertiary amine; the tertiary amine is preferably N' N-dimethylethanolamine or triethylamine.
The invention also provides a preparation method of the water-based adhesive for preparing the air filter paper, which comprises the steps of preparing the component A and preparing the component B;
the preparation of the component A comprises the following steps:
s1, weighing 5-8 parts of seed monomer, 0.05-0.1 part of initiator, 0.8-2.2 parts of composite emulsifier, 0.25-0.6 part of pH buffer and 95-125 parts of deionized water, and carrying out emulsion polymerization reaction in a reaction kettle at the reaction temperature of 74-80 ℃ for 0.5-1.5h to obtain seed emulsion;
s2, adding 23-25 parts of nuclear layer monomer, 1.5-7 parts of functional monomer I and 0.1-0.2 part of initiator dropwise into the seed emulsion obtained in the step S1, reacting at 80-85 ℃ for 1.2-2.5h to obtain nuclear emulsion;
s3, adding 28-32 parts of shell layer monomer, 5.5-14 parts of functional monomer II, 3-10 parts of silane coupling agent I and 0.1-0.2 part of initiator dropwise into the nuclear emulsion obtained in the step S2, reacting at 80-85 ℃ for 2-2.5h, heating to 85-90 ℃ after the reaction is finished, keeping the temperature for 1.5-2.5h, cooling to 40-50 ℃, and adding 0-1.8 parts of functional auxiliary agent to obtain a component A;
the preparation of the component B comprises the following steps:
mixing 10-30 parts of curing assistant and 5-50 parts of silane coupling agent II, and slowly adding the mixture into 50-85 parts of silica sol to obtain a component B;
wherein the seed monomer is prepared from the following components in parts by mass of 3-5: 1 of a mixed monomer of methyl methacrylate and butyl acrylate; the core layer monomer is prepared from the following components in parts by mass of 3-4.5: 1 of a mixed monomer of methyl methacrylate and butyl acrylate; the functional monomer I is prepared from the following components in parts by mass of 0.2-4: 1, a mixed monomer of hydroxyethyl methacrylate and N-hydroxymethyl acrylamide; the functional monomer II is prepared from the following components in parts by mass of 0.1-1.3: 1, a mixed monomer of hydroxyethyl methacrylate and methacrylic acid; the shell layer monomer is prepared from the following components in parts by mass: 0-3: 3-6 of methyl methacrylate, styrene and butyl acrylate.
The invention also provides an application of the aqueous adhesive for the air filter paper in the preparation of the air filter paper, and the application method comprises the following steps: mixing the component A and the component B according to the mass ratio of 1: 0.1-1, and uniformly mixing to obtain a mixed solution; diluting the mixed solution to 5% -15% by using deionized water to obtain a steeping fluid; impregnating base paper of the filter paper with the impregnation liquid; and then curing the impregnated base paper of the filter paper at 100-120 ℃ to obtain the air filter paper.
Compared with the prior art, the invention has the advantages that:
when the aqueous adhesive is used as an air filter paper impregnation liquid, the component A and the component B are mixed to obtain a mixed liquid, and the mixed liquid is diluted to obtain an impregnation liquid; then, impregnating base paper of the air filter paper with the impregnation liquid, and finally curing to obtain the air filter paper; in the curing process of the impregnating solution attached to the surface layer of the air filter paper, along with the evaporation of moisture and a curing auxiliary agent, the pH value of the impregnating solution is reduced, the curing auxiliary agent is moved outwards to drive a component B to generate sol-gel reaction, so that a silanol bond (Si-OH) in the component B is condensed with a silanol bond (Si-OH) obtained by hydrolysis of a silane coupling agent I in the component A to generate a large number of Si-O-Si bonds, and a formed silicon polymer is enriched on the surface of the impregnating solution attached to the surface layer of the air filter paper to form a glassy silicon polymer coating, so that the oil resistance, the bursting strength, the stiffness and the tensile strength of the air filter paper are improved; meanwhile, a silanol bond (Si-OH) formed by hydrolyzing and alcoholyzing one end of a silane coupling agent II in the component B is condensed with a silanol bond (Si-OH) in the silica sol and grafted on the surface of the silica sol, and the other end of the silane coupling agent II reacts with other active groups on the component A, so that the crosslinking degree of the aqueous adhesive is improved, the water resistance of the air filter paper is improved, and the bursting strength, the stiffness and the tensile strength of the air filter paper are further improved; in addition, the surface of the aqueous adhesive is rich in polar groups such as hydroxyl, amino, carboxyl, sulfydryl and the like, so that the aqueous adhesive is very easy to attach to plant fibers in the air filter paper when the air filter paper is soaked, a membrane-shaped substance cannot be formed among the fibers when the air filter paper is cured, through holes in the air filter paper are effectively prevented from being blocked, and therefore the air permeability of the air filter paper is ensured.
Drawings
Fig. 1 is a process flow diagram of the preparation and application of an aqueous adhesive for preparing air filter paper according to an embodiment of the present invention.
FIG. 2 is an SEM of an air filter paper I in an example of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and preferred embodiments.
Examples
The aqueous adhesive for preparing the air filter paper in the embodiment comprises A, B two components; the A, B comprises the following specific components in parts by weight:
1) component A
2) B component
65 portions of silica sol
Silane coupling agent II 9 parts
10 portions of curing assistant
The silane coupling agent I is 3- (methacryloyloxy) propyl trimethoxy silane, and the composite emulsifier is prepared from the following components in parts by mass: 1, a sodium dodecyl sulfate and NP-10 mixed emulsifier, a pH buffering agent is sodium bicarbonate, the initiator is ammonium persulfate, the functional assistant is N' N-dimethylethanolamine, the silane coupling agent II is gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, the curing assistant is isopropanol, and the content of silicon dioxide in the silica sol is 30%.
Referring to the attached figure 1, the preparation method of the aqueous adhesive comprises the preparation of the component A and the preparation of the component B;
the component A is prepared as follows:
s1, weighing 6 parts of seed monomer, 0.075 part of initiator, 1.5 parts of composite emulsifier, 0.375 part of pH buffer and 111 parts of deionized water, and performing emulsion polymerization reaction in a reaction kettle at the reaction temperature of 74 ℃ for 1 hour to obtain seed emulsion;
s2, adding 24 parts of core layer monomer, 2 parts of functional monomer I and 0.15 part of initiator into the seed emulsion obtained in the step S1, reacting at the temperature of 80 ℃ for 1.2h to obtain core emulsion;
s3, adding 30 parts of shell layer monomer, 5.5 parts of functional monomer II, 3 parts of silane coupling agent I and 0.15 part of initiator into the nuclear emulsion obtained in the step S2, reacting at 80 ℃ for 2 hours, heating to 85 ℃ after the reaction is finished, preserving heat for 1.5 hours, cooling to 40 ℃, adding 1.3 parts of functional auxiliary agent, and cooling to room temperature to obtain a component A;
the component B is prepared as follows:
mixing 10 parts of curing assistant and 9 parts of silane coupling agent II, slowly adding the mixture into 65 parts of silica sol for reaction at the reaction temperature of 55 ℃ for 16 hours to obtain a component B;
wherein the seed monomer is prepared from the following raw materials in parts by mass of 4.8: 1.2 a mixed monomer of Methyl Methacrylate (MMA) and Butyl Acrylate (BA); the core layer monomer is prepared from the following components in parts by mass: 4.8 of a mixed monomer of Methyl Methacrylate (MMA) and Butyl Acrylate (BA); the functional monomer I is prepared from the following components in parts by mass: 1 of hydroxyethyl methacrylate (HEMA) and N-methylolacrylamide (N-MA); the functional monomer II is prepared from the following components in parts by mass: 2.5 of a monomer mixture of hydroxyethyl methacrylate (HEMA) and methacrylic acid (MAA); the shell layer monomer is prepared from the following components in parts by mass: 9: 15 of Methyl Methacrylate (MMA), styrene (St) and Butyl Acrylate (BA).
The application method of the aqueous adhesive in the preparation of the air filter paper comprises the following steps:
mixing the component A and the component B according to the mass ratio of 1: 0.55 at 40 ℃, blending for 1.5h to obtain a mixed solution, and measuring the stability of the mixed solution, wherein the results are shown in table 2; diluting the mixed solution to 10% by using deionized water to obtain an impregnation solution, impregnating base paper of filter paper by using the impregnation solution, and then curing the base paper of the filter paper at 120 ℃ to obtain the air filter paper I, wherein the gluing rate is controlled to be 20 +/-2%. The bursting strength, stiffness, tensile strength, water resistance and organic solvent resistance of the air filter paper I are detected and calculated, and the results are shown in Table 1; in addition, the air filter paper I was subjected to electron microscope scanning, and the result is shown in FIG. 1.
Comparative example 1
The aqueous adhesive for preparing the air filter paper in the embodiment only comprises a component A; the component A comprises the following specific components in parts by weight:
component A
Wherein the composite emulsifier is prepared from the following components in parts by mass: 1 and OP-10, wherein the pH buffering agent is sodium dihydrogen phosphate, and the initiator is ammonium persulfate.
The preparation of the aqueous adhesive (component A) is as follows:
the component A is prepared as follows:
s1, weighing 6 parts of seed monomer, 0.075 part of initiator, 1.5 parts of composite emulsifier, 0.375 part of pH buffer and 111 parts of deionized water, and carrying out emulsion polymerization reaction in a reaction kettle at the reaction temperature of 74 ℃ for 1h to obtain seed emulsion;
s2, adding 24 parts of core layer monomer, 3 parts of functional monomer I and 0.15 part of initiator into the seed emulsion obtained in the step S1, reacting at the temperature of 80 ℃ for 1.2h to obtain core emulsion;
s3, adding 30 parts of shell layer monomer, 5 parts of functional monomer II, 3 parts of silane coupling agent I and 0.15 part of initiator into the nuclear emulsion obtained in the step S2, reacting at 80 ℃ for 2 hours, heating to 85 ℃ after the reaction is finished, preserving heat for 1.5 hours, and cooling to room temperature to obtain a component A;
wherein the seed monomer is prepared from the following raw materials in parts by mass: 2, a mixed monomer of MMA and BA; the core layer monomer is prepared from the following components in parts by mass: 6, a mixed monomer of MMA and BA; the functional monomer I is prepared from the following components in parts by mass: 1, a mixed monomer of HEMA and N-MA; the functional monomer II is prepared from the following components in parts by mass: 3, a mixed monomer of HEMA and MAA; the shell layer monomer is prepared from the following components in parts by mass: 9: 13 MMA, St and BA.
The application method of the aqueous adhesive in the preparation of the air filter paper comprises the following steps:
diluting the component A to 10% by using deionized water to obtain an impregnation liquid, impregnating base paper of the filter paper by using the impregnation liquid, and then curing the base paper of the filter paper at 120 ℃ to obtain an air filter paper II, wherein the gluing rate is controlled to be 20 +/-2%. The bursting strength, stiffness, tensile strength, water resistance and organic solvent resistance of the air filter paper II are detected and calculated, and the results are shown in Table 1.
Comparative example 2
The aqueous adhesive for preparing the air filter paper in the embodiment comprises A, B two components; the A, B comprises the following specific components in parts by weight:
1) component A
2) B component
65 portions of silica sol
6 parts of silane coupling agent II
10 portions of curing assistant
Wherein the composite emulsifier is prepared from the following components in parts by mass: 1, sodium dodecyl benzene sulfonate and nonylphenol polyoxyethylene ether (NP-10) mixed emulsifier, wherein a pH buffering agent is sodium bicarbonate, an initiator is ammonium persulfate, a silane coupling agent II is gamma-mercaptopropyl triethoxysilane, a curing assistant is ethanol, and the content of silicon dioxide in silica sol is 30%.
The preparation method of the aqueous adhesive comprises the steps of preparing the component A and preparing the component B;
the component A is prepared as follows:
s1, weighing 6 parts of seed monomer, 0.1 part of initiator, 1.5 parts of composite emulsifier, 0.4 part of pH buffer and 112 parts of deionized water, and carrying out emulsion polymerization reaction with a reaction kettle at the reaction temperature of 74 ℃ for 1h to obtain seed emulsion;
s2, adding 24 parts of core layer monomer, 2 parts of functional monomer I and 0.15 part of initiator into the seed emulsion obtained in the step S1, reacting at the temperature of 80 ℃ for 1.2h to obtain core emulsion;
s3, adding 30 parts of shell layer monomer, 5.8 parts of functional monomer II and 0.15 part of initiator into the nuclear emulsion obtained in the step S2, reacting at 80 ℃ for 2 hours, heating to 85 ℃ after the reaction is finished, preserving heat for 1.5 hours, and cooling to room temperature to obtain a component A;
the component B is prepared as follows:
mixing 10 parts of curing assistant and 6 parts of silane coupling agent II, and slowly adding the mixture into 100 parts of silica sol, wherein the reaction temperature is 55 ℃, and the reaction time is 16 hours to obtain a component B;
wherein the seed monomer is prepared from the following raw materials in parts by mass of 4.8: 1.2 of mixed monomers of MMA and BA; the core layer monomer is prepared from the following components in parts by mass: 4.8 of mixed monomers of MMA and BA; the functional monomer I is prepared from the following components in parts by mass: 1, a mixed monomer of HEMA and N-MA; the functional monomer II is prepared from the following components in parts by mass: 2.8 of a mixed monomer of HEMA and MAA; the shell layer monomer is prepared from the following components in parts by mass: 4, MMA and BA.
The application method of the aqueous adhesive in the preparation of the air filter paper comprises the following steps:
mixing the component A and the component B according to the mass ratio of 1: 0.5, blending for 1.5h at 40 ℃ to obtain a mixed solution; diluting the mixed solution to 10% by using deionized water to obtain an impregnation solution, impregnating base paper of the filter paper by using the impregnation solution, and then curing the base paper of the filter paper at 120 ℃ to obtain the air filter paper III, wherein the gluing rate is controlled to be 20 +/-2%. The bursting strength, stiffness, tensile strength, water resistance and organic solvent resistance of the air filter paper III are detected and calculated, and the results are shown in Table 1.
The performance test method of the air filter paper is as follows:
(1) bursting strength test of paper
The bursting strength of the air filter paper was measured according to the method in GB/T454-2002 determination of bursting strength of paper.
(2) Stiffness test of paper
Detection of air Filter paper according to the method in GB/T22364-
The stiffness of the sheet.
(3) Tensile Strength testing of paper
The tensile strength of the air filter paper was tested according to the method in GB/T12914-2008 determination of tensile strength of paper and paperboard.
(4) Tensile Strength Retention (n-hexadecane) testing of paper
Soaking the air filter paper in n-hexadecane for 24h, taking out, detecting the tensile strength according to a method in GB/T12914-.
(5) Tensile strength retention (water) test of paper
Soaking the air filter paper in deionized water for 24h, taking out, detecting the tensile strength according to a method in GB/T12914-2008 paper and paperboard tensile strength determination, recording data, and calculating the retention rate (water) of the tensile strength of the sample to be detected by the following formula.
(6) Water resistance testing of paper
According to the liquid permeation method in GB-T-460 + 2008_ paper _ sizing degree, the water resistance of the paper is detected by the time when the standard solution permeates through the air filter paper.
(7) Stability testing of Water-soluble Adhesives
Taking a certain amount of mixed liquor in the embodiment, sealing and standing the mixed liquor, and observing the mixed liquor every month
And recording the experimental phenomenon.
(8) Electron microscopy scanning of air filter paper
The surface morphology of the air filter paper is observed by adopting a multifunctional scanning electron microscope, the model of the multifunctional scanning electron microscope is Quanta 450, and the manufacturer is the Netherlands FEI.
TABLE 1 air filter paper Performance test results
The experimental results show that: compared with the air filter paper II and the air filter paper III, the bursting strength, the transverse and longitudinal stiffness and the transverse and longitudinal tensile strength of the air filter paper I are obviously improved, which shows that the modified water-based adhesive can effectively improve the bursting strength, the stiffness and the tensile strength of the air filter paper; the retention rate (n-hexadecane) of the tensile strength of the air filter paper I is obviously higher than that of the tensile strength of the air filter paper II and that of the air filter paper III, which shows that the modified aqueous adhesive can effectively improve the organic solvent resistance of the air filter paper; the tensile strength retention rate (water) of the air filter paper I is obviously higher than that of the air filter paper II and that of the air filter paper III, which shows that the modified water-based adhesive can effectively improve the water resistance of the air filter paper; the permeation time of the standard solution penetrating through the air filter paper I is obviously longer than that of the standard solution penetrating through the air filter paper II and the air filter paper III, which shows that the modified water-based adhesive can effectively improve the water seepage prevention performance of the air filter paper, and the modified water-based adhesive can effectively improve the water resistance performance of the air filter paper from another angle.
TABLE 2 stability test results of the mixed liquor in the examples
The experimental results show that: after the mixed liquid obtained by mixing the component A and the component B is sealed and stored, the mixed liquid can be effectively stored for 6 months, which shows that the mixed liquid has better stability.
FIG. 2 is an SEM of the air filter paper I in the example.
The experimental results show that: the water-based adhesive does not block a large number of through holes on the surface of the air filter paper, so that the air permeability of the air filter paper is ensured.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.
Claims (9)
1. An aqueous adhesive for preparing air filter paper comprises A, B two components; the A, B-containing beverage is characterized in that the specific components and the weight parts of the A, B-containing beverage are as follows:
1) component A
2) B component
50-85 parts of silica sol
5-50 parts of silane coupling agent II
10-30 parts of a curing assistant.
The carbon functional group at one end of the silane coupling agent I is one of vinyl and methacryloxy, and the silicon functional group at the other end of the silane coupling agent I is one of methoxy, ethoxy or isopropoxy;
one end of the silane coupling agent II is a carbon functional group containing one or two of amino, sulfydryl and epoxy, and the other end of the silane coupling agent II is a silicon functional group of methoxy, ethoxy or isopropoxy;
the curing auxiliary agent is alcohol or ether;
the composite emulsifier comprises an anionic emulsifier and a nonionic emulsifier, wherein the mass ratio of the anionic emulsifier to the nonionic emulsifier is (1-3): 1;
the functional auxiliary agent is organic amine;
the preparation of the component A comprises the following steps:
s1, weighing 5-8 parts of seed monomer, 0.05-0.1 part of initiator, 0.8-2.2 parts of composite emulsifier, 0.25-0.6 part of pH buffer and 95-125 parts of deionized water, and carrying out emulsion polymerization reaction in a reaction kettle at the reaction temperature of 74-80 ℃ for 0.5-1.5h to obtain seed emulsion;
s2, adding 23-25 parts of nuclear layer monomer, 1.5-7 parts of functional monomer I and 0.1-0.2 part of initiator dropwise into the seed emulsion obtained in the step S1, reacting at 80-85 ℃ for 1.2-2.5h to obtain nuclear emulsion;
s3, adding 28-32 parts of shell layer monomer, 5.5-14 parts of functional monomer II, 3-10 parts of silane coupling agent I and 0.1-0.2 part of initiator dropwise into the nuclear emulsion obtained in the step S2, reacting at 80-85 ℃ for 2-2.5h, heating to 85-90 ℃ after the reaction is finished, keeping the temperature for 1.5-2.5h, cooling to 40-50 ℃, and adding 0-1.8 parts of functional auxiliary agent to obtain a component A;
the preparation of the component B comprises the following steps:
mixing 10-30 parts of curing assistant and 5-50 parts of silane coupling agent II, and slowly adding the mixture into 50-85 parts of silica sol to obtain a component B;
wherein the seed monomer is prepared from the following components in parts by mass of 3-5: 1 of a mixed monomer of methyl methacrylate and butyl acrylate; the core layer monomer is prepared from the following components in parts by mass of 3-4.5: 1 of a mixed monomer of methyl methacrylate and butyl acrylate; the functional monomer I is prepared from the following components in parts by mass of 0.2-4: 1, a mixed monomer of hydroxyethyl methacrylate and N-hydroxymethyl acrylamide; the functional monomer II is prepared from the following components in parts by mass of 0.1-1.3: 1, a mixed monomer of hydroxyethyl methacrylate and methacrylic acid; the shell layer monomer is prepared from the following components in parts by mass: 0-3: 3-6 of methyl methacrylate, styrene and butyl acrylate.
2. The aqueous adhesive of claim 1 wherein the silane coupling agent I is 3- (methacryloyloxy) propyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, or vinyltriisopropoxysilane.
3. The aqueous adhesive of claim 1 wherein the silane coupling agent II is gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, beta- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, gamma-mercaptopropyltriethoxysilane, or gamma-aminopropyltriethoxysilane.
4. The aqueous adhesive of claim 1 wherein the alcohol is ethanol, propanol, butanol, isopropanol, isobutanol, or dipropylene glycol; the ether is dipropylene glycol methyl ether or butyl ether.
5. The aqueous adhesive of claim 1 wherein the anionic emulsifier is an alkyl carboxylate, alkyl sulfate, or alkyl sulfonate; the alkyl carboxylate is sodium dodecyl sulfate; the alkyl sulfate is sodium dodecyl diphenyl ether disulfonate; the alkyl sulfonate is sodium dodecyl benzene sulfonate; the nonionic emulsifier is alkylphenol polyoxyethylene ether, and the alkylphenol polyoxyethylene ether is nonylphenol polyoxyethylene ether or octylphenol polyoxyethylene ether; the polyoxyethylene nonyl phenyl ether is NP-10, and the polyoxyethylene octyl phenyl ether is OP-10.
6. The aqueous adhesive of claim 1 wherein the pH buffer is sodium bicarbonate or sodium dihydrogen phosphate.
7. The aqueous adhesive of claim 1 wherein the initiator is a persulfate or azo water-soluble salt; the persulfate is inorganic persulfate; the inorganic persulfate is potassium persulfate, sodium persulfate or ammonium polysulfate.
8. The water-soluble adhesive according to claim 1, wherein the organic amine is a tertiary amine; the tertiary amine is N' N-dimethylethanolamine or triethylamine.
9. Use of an aqueous adhesive for air filter paper according to any one of claims 1 to 8 in the preparation of air filter paper, in the following way: mixing the component A and the component B according to the mass ratio of 1: 0.1-1, and uniformly mixing to obtain a mixed solution; diluting the mixed solution to 5% -15% by using deionized water to obtain an impregnation solution, and treating the filter paper base paper by using the impregnation solution; and then curing the impregnated base paper of the filter paper at 100-120 ℃ to obtain the air filter paper.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4789710A (en) * | 1986-12-22 | 1988-12-06 | Kanegafuchi Kagaku Kogyo Kabushiki Kaisha | Process for preparation of a room-temperature curable resin |
| CN1814629A (en) * | 2005-02-05 | 2006-08-09 | 广州宏昌胶粘带厂 | Inorganic nano-particle-containing nucleocapsid inorganic-organic composite pressure-sensitive adhesive emulsion, and its preparing method and use |
| CN101287788A (en) * | 2005-07-26 | 2008-10-15 | 可耐福保温材料有限公司 | Binders and materials made therewith |
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2018
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4789710A (en) * | 1986-12-22 | 1988-12-06 | Kanegafuchi Kagaku Kogyo Kabushiki Kaisha | Process for preparation of a room-temperature curable resin |
| CN1814629A (en) * | 2005-02-05 | 2006-08-09 | 广州宏昌胶粘带厂 | Inorganic nano-particle-containing nucleocapsid inorganic-organic composite pressure-sensitive adhesive emulsion, and its preparing method and use |
| CN101287788A (en) * | 2005-07-26 | 2008-10-15 | 可耐福保温材料有限公司 | Binders and materials made therewith |
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